The structure and the magnetic field of Uranus

Details The structure and the magnetic field of Uranus The structure and the magnetic field of Uranus

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..675t&link_type=abstract

Geophysical Research Letters, vol. 6, Aug. 1979, p. 675, 676.

Physics

3

Planetary Cores, Planetary Magnetic Fields, Planetary Structure, Uranus (Planet), Dynamo Theory, Hydrogen, Melting Points, Planetary Composition, Planetary Rotation, Water

Scientific paper

The two-layer model of Uranus is recalculated using a rotation period of 24 rather than 10.8 hours and also the melting temperatures of H2O and of the constituents of the core are evaluated. It appears that the core is solid and the H2O-containing mantle is liquid. The conductivities of H2O, 'metallic' H2 and metallic H are roughly in the ratio of 1:100:10000 so that the convective velocities required for the operation of a dynamo would have to be about 10, 0.1 and 0.001 cm/sec, respectively. The very low thermal flux from Uranus suggests that, unless a precessional dynamo is invoked, metallically conducting H2 or metallic hydrogen has to be present in the mantle.

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